Canon EF 70-200mm f/2.8 L IS II + 2x Converter

[mikehillman89]

Based on descriptions and talks in the forums I was thinking that even the 1.4x extender was pushing your luck but you've shown that it indeed can get some stunning photos! Great shots!

[greggf]

that's the funny thing, I didn't like the results with the 1.4x. that's why I was so shocked to see the 2x results. the lens even did well with the 2x and1.4x stacked!! Focus did hunt quite a bit, but it would be ok with static subjects!!

[neuroanatomist]

that's the funny thing, I didn't like the results with the 1.4x. that's why I was so shocked to see the 2x results.

It's very unusual for IQ to be better with the 2x than the 1.4x. The 2x Extender should result in more IQ degradation, more loss of contrast, etc. You can see differences with this lens and the 1/4x vs. 2x on Bryan's ISO 12233 charts - the 1/4x is pretty darn good, the 2x less so (but still quite usable).


Perhaps there's an issue with your 1.4x? I get wonderful images with myEF 70-200mm f/2.8<span>LIS II USM and EF 1.4x II Extender.


Did you perform an AF Microadjustment on the combo of 70-200 + 1.4x? Mine required +6, enough to result in a reasonable percentage of slightly OOF shots if I hadn't done the adjustment.

[Richard Lane]

Hey Everyone,


I also have the 70-200 2.8 II as well as the 1.4x II and 2x II Converters used in combination with the 7D and I feel that the 1.4x II is far better than the 2x II converter, and certainly the gap becomes even more noticeable as the Sun goes down, in favor of the 1.4x II.


My experiences with these combinations, echo what neuroanatomist as observed, I have personally noticed less contrast, slower auto-focus, as well as increased noise with the 2x II. In my experience, the1.4x yields consistently better results, than the 2x, and even the 1.4x degrades overall quality a bit, but certainly acceptable, but just to a lesser degree than the 2x II. I think you may have a problem with your 1.4x converter.


Is it possible that you were comparing the first edition 1.4x converter with the newer 2x II, otherwise you should try to borrow a different 1.4x II.


Rich